Results 11 to 20 of about 177 (121)

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

Energies, 2019
The continuous, non-intermitted service of electrical grids relies on the reliability of their assets, e.g., power transformers. Local insulation defects can result in serve failures such as breakdowns with severe subsequent costs. The prevention of such
Martin Siegel, Michael Beltle, Stefan Tenbohlen   +2 more
exaly   +3 more sources

Laboratory stand for development of method and system for continuous non-contact non-destructive testing of technical condition of insulation equipment [PDF]

Омский научный вестник, 2021
Measurement of partial discharges (PD) is a generally accepted method of diagnosing the insulation of electrical equipment worldwide. Today, the trend is to move from conventional offline testing to online monitoring to predict the service life of ...
T. G. Galieva, D. A. Ivanov, M. F. Sadykov, A. V. Golenishchev-Kutuzov   +3 more
doaj   +1 more source

Registrador universal de alta tensión para los laboratorios de ensayo

Tecnología en Marcha, 2021
Tradicionalmente los laboratorios de alta tensión (AT) han precisado diferentes instrumentos de medida para medir las tensiones alternas 50/60 Hz (AC), mediante voltímetros de cresta, impulsos de tensión tipo rayo, mediante medidores de tensiones de ...
Abderrahim Khamlichi, Fernando Garnacho, Jorge Rovira, Pascual Simón   +3 more
doaj   +1 more source

Karakteristik Peluahan pada Permukaan Akrilik di Sekeliling Elektroda Plat

Journal of Energy and Electrical Engineering, 2023
Lebih dari 50% kerusakan pada instrumen sistem daya disebabkan oleh cacat isolator. Cacat isolator ini terkait erat dengan peluahan sebagian karena selain memicu terjadinya kerusakan pada isolator juga bisa menjadi pertanda awal kerusakan isolator.
rian nurdiansyah, neris peri ardiansyah, umar khayam   +2 more
doaj   +1 more source

Study on partial discharge and charge accumulation characteristics of oil‐pressboard insulation under DC superimposed harmonic voltage

High Voltage, Volume 8, Issue 6, Page 1215-1224, December 2023., 2023
Abstract The oil‐pressboard insulation on the valve side of the converter transformer withstands pulsating square wave voltage. The voltage contains lots of DC components and high‐order harmonics, which is likely to cause insulation failures. The partial discharge and space charge experiments of oil‐impregnated pressboard under DC superimposed harmonic
Shuqi Li, Qiang Wang, Dongxin He, Liangkai Wang, Qingquan Li, Wen Si   +5 more
wiley   +1 more source

Study on characteristics gases of metal protrusions partial discharge in 10‐kV air‐insulated switchgear

IET Science, Measurement &Technology, Volume 17, Issue 6, Page 221-229, August 2023., 2023
In order to study the feasibility of the method of gas composition analysis for 10‐kV air‐insulated switchgear, this paper carried out a monitoring experiment of characteristic gases, comprising CO, NO2 and O3, of metal protrusion PD. In addition, three practical factors were considered to carry out the comparative experiments: voltage, air humidity ...
Qipeng Tan, Bin Song, Linong Wang, Shaocheng Wu   +3 more
wiley   +1 more source

Large‐scale plasma grafts voltage stabilizer on hexagonal boron nitride for improving electrical insulation and thermal conductivity of epoxy composite

High Voltage, Volume 8, Issue 3, Page 550-559, June 2023., 2023
Abstract Better electrical insulation and thermal management are both urgently required in integrated power semiconductors. Electrical insulation epoxy encapsulation suffers from poor heat conduction, which has increasingly become a bottleneck of power semiconductors integration.
Penghao Zhang, Chenguo Yao, Liang Yu, Xuetong Zhao, Lisheng Zhao, Linghan Lan, Shoulong Dong   +6 more
wiley   +1 more source

Application of the convolutional neural network in partial discharge spectrum recognition of power apparatus

IET Science, Measurement &Technology, Volume 17, Issue 4, Page 137-146, June 2023., 2023
Abstract Partial discharge (PD) detection is used to evaluate the insulation status of high‐voltage equipment. The most challenging aspect of traditional PD recognition is extracting features from the discharge signal. Accordingly, this study applied the visual geometry group‐19 (VGG‐19) model to gas‐insulated switchgear (GIS) PD image recognition.
Feng‐Chang Gu
wiley   +1 more source

Evaluation of a calibration technique in measuring partial discharges inside mineral oils with a high‐frequency current transformer (HFCT) sensor: A case study

IET Generation, Transmission &Distribution, Volume 17, Issue 3, Page 706-715, February 2023., 2023
• In this paper, a PD calibrator, an HFCT sensor, and a transformer insulation oil breakdown voltage (BDV) test cell have been built and presented in detail. Also, we gave guidance for their manufacturing in the article. • Also, a discharge calibration method for the HFCT has been presented. •The test verification on distribution transformers is given,
Hamidreza Besharatifard, Saeed Hasanzadeh, S M Muyeen, Innocent Kamwa   +3 more
wiley   +1 more source

Time-Frequency Analysis of Partial Discharge Current Pulses in Different Gas Environment under Lightning Impulse

Measurement Science Review, 2020
This paper deals with a time-frequency analysis of the measured partial discharge (PD) currents in different insulation gases. These gas environments consist of a pure SF6 (sulphur-hexafluoride) and sulphur-hexafluoride and nitrogen (1 % SF6 + 99 % N2 ...
Arikan Kemal, Önal Emel, Şeker Serhat
doaj   +1 more source